que of the day

rest mass of photon is why? infinite zero small

when am

medical entry test mcqs: Most common type of atrial septal defect a,primum ...

medical entry test mcqs: Most common type of atrial septal defect a,primum ...: Most common type of atrial septal defect a, primum asd , b, secumdum asd

Most common type of atrial septal defect a, primum asd , b, secumdum asd

mypoetry:

the name of photon was given by ?
maxwell or plank